Closure for cans



April 13 1926. v 1,580,602

F. S. HYATT CLOSURE FOR CANS Filed Nov. 5,-1921 EMJNVENTOR ATTORNEY Patented Apr. 13, 1925.

UNITED sra'rss FRANK S. HYATT, 0F BROOKLYN, NEW YORK.

CLOSURE ron oAivs.

Application .filed. November 5, 1921. Serial No. 512,974.

To all whom it may concern:

Be it known that I, FRANK S. HYA'rr, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Closures for Cans, of which the following is a specilication.

My invention relates to that class of closures for cans wherein a temporary seal is provided in the bottom of the mouth and is rupturable to allow removal of the contents, the mouth itself being provided with a screw stopper permitting temporary sealing after the opening of the. can.

My invention relates more particularly to the construction of the top portion of the metal stopper whereby removal of the stopper either by hand or by the application of a wrench, in case the same should stick, is greatly facilitated, and also to the sealing disk at the bottom of the mouth which is forced into place when the stopper is applied after filling of the can, the object of the latter portion -of my invention being both to chcapen and facilitate the manufacture and at'the same time to form an effectual seal where the sealing disk engages the mouth.

To these ends my invention consists in the construction and the method of manufacturing the closure as hereinafter more par ticularly described and then set forth in the claims. I

Fig. 1 is a top view of a closure embodying nay-invention.

Fig. 2 is a vertical section on the line 2+2 Fig. 1. v

Fig. 3 is a side view of the stopper T18. taehed from the mouth.

Fig.4 is a-section on the line l4.- Fig. 1. Fig. 5 shows a strip of metal from which the sealing disks are manufactured and Fig. 6 a cross-section on the line 6'6 Fig. 5.

Fig. 7 shows in enlarged section the complete sealing disk stamped out from the strip and ready for application to the mouth of the can after the filling of the can.

' Referring to the drawings? 7 1 indicates the sheet metal mouth of the can which is formed from sheet metal and provided'with the screw threads formed as indicated at 2 on itsside for reception of the screw-threaded stopper. Said mouth is provided with the pouring lip or trough 1 to facilitate the removal of the contents after the rupture of the seal. Said mouth is furnished, as indicated at 3, with a flat inwardly extending shoulder, offset or ledge resting directly upon the upper surface of the can top 5 and affording a flat surface for engagement of the sealing disc provided on its under surface with an adherent coating I used. at the point of engagement in additio'n, if desired, to secure a good scam.

6 indicates the sealing disk preferably depressed at its center and furnished with the overhanging lip 7 which seats upon the ledge. Said sealing disk is preferably made V of sheet metal and on its under surface is coated with a coating of sealing material applied like a paint or varnish. In practice I use a paint which is semi-flexible so as not to be liable to chipping or breaking of the coated surface in handling during the process of manufacture. The effective seal is produced by engagement of the coated under surface of the flange 7 with the shoulder or ledge.

In the manufacture of this portion of the closure I provide a strip as indicated in Fig. 5, made of sheet metal or other suitable material,which for, convenience and ease of manufacture of the device, is coated over its whole surface as indicated in the cross section Fig. 6, with an adherent coating of paint or similar sealing material 8. This coating having been applied and allowed to dry, the metal sealing disksare stamped out of the same, as indicated by the circular lines Fig.6, to producethe desired form of sealing disk shownin enlarged view Fig. 7, thus affordinga disk with an adherent sealing surface on the under side of the lip or flange 7 where an effective sealing at the point of engagement of the sealing disk with the mouth is afiorded when the stopper, after filling of the can, is forced down into the mouth andagainst the sealing disk. Said sealing disk is retained in place by the frictional engagement of its edges with the inner wall of the mouth.

Thus, when the stopper is removed and after the sealing disc is perforated, it will remain in place ready to co-operate with the stopper to re-seal the can when a portion of the contents has been poured out.

Referring now to the stopper to be employed in connection with the mouth as a temporary closure or seal, said stopper is made of sheet metal, stamped in any suitable way as for instance by a suitable stamp and is provided with the screw threads 9 co-operating with the screw-threads 2 of the mouth. 10 indicates the bottom of the stopper which is integral with the side walls having the thread 9 and engages directly by its under surface with the upper surface of the metal disc near the edge of the latter to force the latter down against the flat ledge 3 and firmly compress the coating of adherent sealing material on the bottom surface of the latter on to the flat surface of said ledge, thus forming at this point a wide sealing surface or joint. 11- indicates the top of the stopper. This is a piece of metal formed in hexagonal, octagonal or similar shape to afford a number of angular protuberances 13 along the top edge of the stopper and is socured in place by turning over the edge of the metal forming the stopper proper, by means of a suitable stamp or die, on the top 11. thereby holding the same permanently in position. The turning over of the side walls upon the angular top results also in the production of slight swellings or enlargements just below the top and as indicated by the shading 12 Fig. 3 and in the cross-sectional view Fig. 4. These swellings assist in providing the hand or finger hold that is afforded by the angular outline at the top edge of the stopper. Said angular form of the top may also be utilized for the application of a wrench in case the stopper should stick.

I do not limit myself to any particular number of angles at the top of the stopper nor to any particular form in outline of said top 11. The same might be circular and also the angular finger hold might be afforded by knurling the edge of the top on the outer surface of the side wall which is turned over to hold the top plate 11 in place. I

My invention not only facilitates the man ufacture of the can closure shown but also, as will be seen, insures an effective sealing of the same during transportation and, after breaking of the seal, facilitates the use of the stopper then employed as a temporary stopper to close and open the'nozzle for the pouring of the contents.

lVhat I claim as my invention is 1. In a closure of the character described, the combination with the sheet metal threaded mouth of a sheet metal threaded stopper having an angular top held in place by the turned over edge of the side wall. of the stopper and affording a number of spaced annular protuberances connected by straight portions of edge with slight swellings or enlargements just below said protuberances, the Whole providing not only a hand or finger hold but permitting the application of a wrench in case the stopper should stick.

2. A closure for cans comprising a sheet metal mouth having an interior integral in wardly extending ledge, shoulder or offset near its bottom resting on the top of the can around an opening therein, the lip of said offset being continued around the edge of the opening and overturned against the under side of the top, a sealing disk provided with a lip or flange coated on its under surface with an adherent sealing coating and adapted to engage the upper surface of said. shoulder and a co-operating sheet metal threaded stopper adapted to engage the mouth and force the sealing disk down to its seat by direct engagen'lent of the metallic bottom of the stopper with the upper surface of said disk to form a permanent seal until rupture of the disk itself when the contents of the can are to be poured.

8. A closure for cans comprising an internally threaded sheet metal mouth provided with a pouring lip and engaged with the under surface of the top of the can by its turned-over bottom edge and a flat shoulder or ledge above said turned-over edge resting upon the top of the can, a sealing disk coated on its under surface with an adherent coating and adapted to engage at its edge upon said shoulder and a co-operating externally threaded sheet metal stopper adapted to engage directly with the upper surface of said sealing disk at its edge and force it into sealing position.

4. A closure for cans comprising an internally threaded sheet metal mouth provided with a pouring lip and engaged with the body by its turnedover bottom edge and a shoulder or ledge above said turned-over edge resting upon the top of the can, a sealing disk temporarily retained in place by frictional engagement of its edges with the inner wall of the sheet metal mouth and adapted to engage at its edge upon said shoulder and a co-operating externally threaded sheet metal stopper having a polygonal top and adapted to engage said edge directly by a metallic portion of said stopper and force it into sealing position.

Signed at New York in the county of New York and State of New York this 4th day of October A. D. 1921.

' FRANK S. HYATT. 

